24 research outputs found
Prevalence and antimicrobial susceptibility pattern of methicillin resistant Staphylococcus aureus isolated from clinical samples at Yekatit 12 Hospital Medical College, Addis Ababa, Ethiopia
Progress on the commissioning of ALICE, the energy recovery linac-based light source at Daresbury Laboratory
RECENT DEVELOPMENTS ON ALICE (ACCELERATORS AND LASERS IN COMBINED EXPERIMENTS) AT DARESBURY LABORATORY
Abstract Progress made in ALICE (Accelerators and Lasers In Combined Experiments) commissioning and a summary of the latest experimental results are presented in this paper. After an extensive work on beam loading effects in SC RF booster and linac cavities' conditioning, ALICE can now operate in full energy recovery mode at a bunch charge of 40pC, a beam energy of 27.5MeV and train lengths of up to 100µs. This improved operation of the machine has resulted in generation of coherentlyenhanced broadband terahertz radiation with an energy of several tens of microjoules per pulse and in successful demonstration of the Compton Back-Scattering x-ray source experiment. Experiments on the exposure of living cells to terahertz radiation have been started. These and other developments on ALICE are reported. MACHINE STATUS ALICE, an energy-recovery superconducting linac GaAs photocathode lifetime is now sufficiently long for routine ALICE operation at 40pC. Normally cathode recaesiation is performed once a month, when the quantum efficiency decreases from initial ~3% to below ~0.5%. Over the past year, a number of changes in gradient settings of SC cavities (booster and main linac) were made with the aim of optimising the RF set up and to accommodate limitations presented by the RF system. Each of these variations required significant changes in the overall machine set up. It can now be routinely operated at 27.5MeV with the total beam losses not exceeding 5 to 7%. The energy spectrum of the beam exiting the first cavity of the booster (BC1) with the second cavity (BC2) switched off (resulting in a beam energy of 3.9MeV, compared to the nominal injector energy of 6.5MeV) is shown i
Assessment of multidrug resistance in bacterial isolates from urinary tract-infected patients
Health and cancer prevention: implications of the knowledge and beliefs of 15-16 year old school pupils in South Africa
Compact solar autoclave based on steam generation using broadband light-harvesting nanoparticles
The lack of readily available sterilization processes for medicine
and dentistry practices in the developing world is a major risk
factor for the propagation of disease. Modern medical facilities in
the developed world often use autoclave systems to sterilize
medical instruments and equipment and process waste that
could contain harmful contagions. Here, we show the use of
broadband light-absorbing nanoparticles as solar photothermal
heaters, which generate high-temperature steam for a standalone,
efficient solar autoclave useful for sanitation of instruments or
materials in resource-limited, remote locations. Sterilization was
verified using a standard Geobacillus stearothermophilus-based
biological indicator